Antiglare or antidazzle device for lamps



June 30, 1931. l. GEARY 1,812,779

' ANTIGLARE OR ANTIDAZZLE DEVICE FOR LAMPS Filed Jan. 4, 1929 myz.

Patented June 30, 1931 PATENT OFFICE ISAAC GEARY, OF LONDON ENGLAND AN TIGLARE OR ANTIDAZZLE DEVICE FOR LAMPS Application filed. January 4, 1929, Serial No. 330,248, and in Great Britain January 9, 1928.

This invention relates to an improved antiglare or anti-dazzle device for use chiefly with the lamps of road vehicles and to devices of the type wherein the light passes through a screen of strip or blade members arranged in front of the lens or the lamp front and the source of light.

According to the present invention, in a device of the kind referred to, the blades or screens are arranged around the periphery of the lamp front substantially at right angles thereto and extend from the outer edge thereof to points within the circumference in such a manner that their surfaces lie at 5 various angles to the horizontal plane containing the axis of the lamp, said blades however not extending completely across the source of light, the passage of light rays laterally between the blades being unobstructed.

In the case of lamps having circular lenses or fronts the blades or screens may be arranged along radii thereof and may terminate at their inner ends on the circumference of a circle concentric with the lens or front, but the blades or screens need not be of equal lengths and they may terminate at their inner ends at points which are eccentric to the lens or front. The screens or blades are preferably of thin sheet metal or of a sufliciently opaque material and may be permanently attached to the lamp or may be carried on a narrow detachable rim, ring, or the like which may be clipped or otherwise secured to a convenient part of the lamp.

With the above described arrangement the screens or blades do not interfere with the normal illumination of the lamp as they are so thin that viewed from the front there is no appreciable obscuration of the lens or front of the lamp and light can pass up be tween them freely. If, however, the point of view he changed from a front central view to a side or angular view, then the screens become effective in preventing the glare from reaching the eyes.

To enable the invention to be fully understood it will now be described by reference to the accompanying drawings in which 5 Fig. 1 is a side elevation partly in section of a lamp fitted with a device according to one form of the invention, and

Fig. 2 is a front elevation thereof.

Fig. 3 is a front elevation of a modification.

As shewn, the front rim 1 of the lamp 2 is fitted with a channelled ring 3 attached thereto by suitable clips 4, the ring serving to support aseries of blades or screens 5 in a position at right angles to the vertical plane of the lens or front of the lamp. These blades are shaped as shewn in Fig. 1 and are each formed at their rear ends with a lug 6 which fits into a slot in the ring 3. The blades are arranged along radii and extend over the front of the lamp as shewn in Fig. 1, as shewn in Fig. 3, the blades may be of unequal lengths. If desired, the blades may be further supported at points near their free outer ends by means of a wire or other ring to which they are attached, the ring passing over the outside of the blades or through them, or being arranged at their inner ends.

In the examples shewn the inner ends of the blades are shewn as terminating at points lying in a circle concentric with the rim of the lens or lamp but they may terminate at other points, as for example at points in a circle which is eccentric. Further the blades are shewn as fitted around the whole circumference of the lens or front, but in some case only a portion of the circumference, the upper half for example, may be fitted with blades. The blades may be permanently secured to the lamp rim if desired and their length may be varied as desired.

Any suitable sheet material, metal or otherwise may be used for the blades.

Having thus described the nature of my said invention and the best means I know of carrying the same into practical effect, I claim An anti-glare screen attachment for the outside forward portion of a lamp, comprising a series of blades arranged around the entire periphery of the lamp front, and projecting forwardly thereof, and substantially at right angles thereto, said blades having their inner opposite ends equally spaced apart throughout their entire length to provide an unscreened area of uniform circumference therebetween, said blades being radially spaced apart around the entire periphery of the lamp front whereby uniform unobstructed light passages are provided between said blades around the entire periphery of the lamp front to provide alarge area of deffusion in the neighborhood of the lamp.

In testimony whereof I have signed my name to this specification.

ISAAC GEARY. 

